Although airlines are not required to issue full refunds for a ticket paid for, then not needed because the person named on the ticket dies prior to the flight, the airline should issue a refund for good customer relations. Offering to issue a credit to the person named on the ticket will not work, as the person has died and cannot use the credit.
If you have experienced this problem and have not been able to receive a refund for the ticket price, please contact me with complete details, and I will contact the airline for you in an effort to get the money paid for the ticket refunded .
There is no charge for this service. Just email me at firstname.lastname@example.org.